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Influence of ligand states on the relationship between orbital moment and magnetocrystalline anisotropy
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics. (Molecular and Condensed Matter Physics)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
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2007 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 99, no 17, 177207- p.Article in journal (Refereed) Published
Abstract [en]

The spin and orbital moments of Au/Co/Au trilayers grown on a W(110) single crystal substrate have been investigated by means of x-ray magnetic circular dichroism. Our findings suggest that the orbital moment of Co does not obtain a maximum value along the easy axis, in contrast with previous experience. This is attributed to the large spin-orbit interaction within the Au caps. Both second order perturbation theory and first principles calculations show how the magnetocrystalline anisotropy (MCA) is dramatically influenced by this effect, and how this leads to the fact that the orbital moment anisotropy is not proportional to the MCA.

Place, publisher, year, edition, pages
2007. Vol. 99, no 17, 177207- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-94437DOI: 10.1103/PhysRevLett.99.177207ISI: 000250506000066OAI: oai:DiVA.org:uu-94437DiVA: diva2:168279
Available from: 2006-05-03 Created: 2006-05-03 Last updated: 2017-01-25
In thesis
1. Exploring the Magnetism of Ultra Thin 3d Transition Metal Films
Open this publication in new window or tab >>Exploring the Magnetism of Ultra Thin 3d Transition Metal Films
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis the magnetic and structural properties of ultra-thin 3d transition metals films have been investigated, in particular Fe, Ni and Co films. X-ray Magnetic Circular Dichroism (XMCD) has provided element specific spin (ms ) and orbital (ml ) moments per atom by utilizing the magneto optic sum-rules. Element specific hysteresis curves have been measured by means of X-ray Resonant Magnetic Scattering (XRMS), and the local crystallographic structure has been investigated using Extended X-ray Absorption Fine Structure (EXAFS).

By performing XMCD on Fe/Ag(100) we observe a spin reorientation from in-plane to out-of-plane as the Fe thickness is lowered. At temperatures below 300K it occurs around 5-7 mono layers (ML) of Fe. While reorienting the magnetization out-of-plane the orbital moment increases with 125% but only a minor increase (5%) of the spin moment is observed. Extended X-ray Absorption Fine Structure (EXAFS) measurements indicate that films 6 ML and thicker have a bulk-like bcc structure. For the thin out-of-plane films, the local crystallographic structure is more complicated.

The spin reorientation of the Au/Co/Au tri-layer system has been studied as a function of temperature, Co layer and Au cap thickness. An unexpected behavior of the orbital moment upon spin reorientation is found in these systems. An ex-situ prepared sample shows a smooth spin reorientation from an in-plane to an out-of-plane easy magnetization direction as the temperature is lowered from 300K to 200K. In-situ prepared samples have also been investigated and a novel phase diagram has been identified. The Au/Co interface has been explored during the Au capping by means of photoemission measurements.

In the bi- and tri-layer system of Fe and Ni we have been able to manipulate the spin reorientation by varying the Fe and Ni thickness. A novel non-collinear interlayer exchange interaction for 3d ferro magnets in direct contact has been discovered for a set of samples. This exchange interaction is found to be strongly dependant on the preparation conditions.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2006. v + 47 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 175
Keyword
Physics, thin film, xmcd, xrms, exafs, anisotropy, magnetism, Fe, Ni, Co, Ag, Cu, Fysik
Identifiers
urn:nbn:se:uu:diva-6836 (URN)91-554-6554-4 (ISBN)
Public defence
2006-05-24, Polhemsalen, Ångströmlabratoriet, Lägerhyddsvägen 1, Uppsala, 10:15
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Available from: 2006-05-03 Created: 2006-05-03 Last updated: 2013-09-18Bibliographically approved

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Arvanitis, DimitriSanyal, BiplabEriksson, OlleNordström, LarsArvanitis, Dimitri

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